How do I design a tandem garage for two vehicles on a narrow lot in Moncton NB?

A tandem garage (vehicles parked one behind the other) is an excellent solution for narrow lots in Moncton, typically requiring only 12-14 feet of width compared to 20-24 feet for a side-by-side two-car garage. The key is designing adequate depth — usually 36-40 feet — while ensuring the garage fits within your lot's setback requirements and provides practical access for daily use.

Tandem Garage Dimensions and Layout

The standard tandem garage measures 12x36 to 14x40 feet, providing space for two full-size vehicles parked nose-to-tail. A 12-foot width accommodates compact to mid-size vehicles comfortably, while 14 feet works better for trucks, SUVs, or if you need walking space alongside the vehicles. The 36-foot depth allows for two 18-foot parking spaces, though extending to 40 feet provides valuable storage space at the back.

For Moncton's typical narrow infill lots (often 40-50 feet wide), a tandem garage can fit where a traditional two-car garage cannot. However, you must verify setback requirements with the City of Moncton — detached garages typically require 3-5 feet from side property lines, meaning your 50-foot lot could accommodate a 14-foot-wide garage with proper setbacks. Always obtain a current survey before finalizing your design, as encroaching on property lines or easements can force costly modifications or demolition.

Practical Design Considerations

The biggest challenge with tandem garages is vehicle access — the person with the car parked in back must coordinate with the front car owner, or the front car must be moved to access the rear vehicle. This works well for households where one vehicle is used primarily for commuting (parked in front for daily access) and the second is used occasionally (parked in back). It's less practical if both vehicles are used independently throughout the day.

Consider installing two separate overhead doors — a standard 8 or 9-foot door at the front and a second door at the back if your lot allows rear access. This eliminates the access coordination issue but requires additional width (typically 14-16 feet minimum) and increases construction costs by $1,500-$3,000 for the second door and additional framing.

Foundation and Structural Requirements

Moncton's frost depth requires foundations extending 4-5 feet below grade, and the longer tandem design actually works in your favour structurally. The 36-40 foot length provides excellent stability, and the narrower width reduces the span requirements for roof trusses. Most tandem garages can use standard 2x8 or 2x10 roof trusses at 24-inch centers, keeping structural costs reasonable.

For the foundation, a full frost wall with concrete slab is the most reliable approach in Moncton's clay soils and freeze-thaw cycles. The longer perimeter does increase concrete costs — expect $8,000-$12,000 for foundation and slab compared to $6,000-$9,000 for a standard single-car garage. However, this is still significantly less than the foundation cost for a full two-car side-by-side garage.

Moncton-Specific Site Planning

Moncton's established neighborhoods often have mature trees, overhead utilities, and drainage considerations that affect garage placement. The longer tandem footprint gives you more flexibility in positioning the garage to avoid tree roots or utility lines while maintaining proper drainage away from the foundation.

Pay special attention to snow management around your tandem garage. The longer building creates more roof area and potential snow load, and you'll need adequate space for snow storage when clearing the driveway. Plan your driveway approach carefully — a 36-40 foot deep garage requires backing out a significant distance, which can be challenging in winter conditions with limited visibility.

Interior Layout and Storage

The tandem design offers excellent storage opportunities along the long side walls. Plan for wall-mounted storage systems, overhead storage racks, and potentially a workshop area at the rear behind the back vehicle. Many Moncton homeowners use the rear 6-8 feet for lawn equipment, seasonal storage, and workshop space.

Consider electrical planning during design — you'll want outlets and lighting along both sides of the garage, plus dedicated circuits if you plan to install EV charging or workshop equipment. Running electrical during construction costs $1,500-$2,500, while retrofitting after completion can cost $3,000-$4,000.

Cost Expectations

A basic tandem garage in Moncton typically costs $35,000-$55,000 for a detached structure with concrete foundation, standard framing, asphalt shingle roof, vinyl siding, one overhead door, service door, and basic electrical. This represents excellent value compared to $45,000-$70,000 for a traditional two-car garage, while providing the same vehicle capacity on a narrower lot.

When to Hire a Professional

Tandem garage design requires careful attention to lot constraints, setbacks, drainage, and structural requirements specific to your site. A local contractor experienced with Moncton's soil conditions and municipal requirements can optimize the design for your specific lot while ensuring code compliance and proper permits.

Need help finding a professional garage builder familiar with narrow lot construction? New Brunswick Garages can match you with experienced contractors in the Moncton area for free estimates on your tandem garage project.